Adding watermark to text box

var watermark = 'Enter state';

            //init, set watermark text and class

            $('#txtstate').val(watermark).addClass('watermark');

            //if blur and no value inside, set watermark text and class again.

            $('#txtstate').blur(function () {

                if ($(this).val().length == 0) {

                    $(this).val(watermark).addClass('watermark');

                }

            });

            //if focus and text is watermrk, set it to empty and remove the watermark class

            $('#txtstate').focus(function () {

                if ($(this).val() == watermark) {

                    $(this).val('').removeClass('watermark');

                }

            });